Commodore Amiga A1000, Hardware Reference Manual

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COORDINATES
A pair of numbers shown in the form (x,y), where x is an offset from the left side of the
display or display window and y is an offset from the top.
COPPER
Display-synchronized coprocessor that resides on one of the Amiga custom chips and
directs the graphics display.
COPROCESSOR
Processor that adds its instruction set to that of the main processor.
CURSOR KEYS
Keys for moving something on the screen.
DATA FETCH
The number of words fetched for each line of the display.
DELAY
In playfield horizontal scrolling, specifies how many pixels the picture will shift for each
display field. Delay controls the speed of scrolling.
DENISE
One of the three main Amiga custom chips. Contains the circuitry for the color palette,
sprites, and video output.
DEPTH
Number of bit-planes in a display.
DIGITAL-TO-ANALOG CONVERTER
A device that converts a binary quantity to an analog level.
DIRECT MEMORY ACCESS
An arrangement whereby intelligent devices can read or write memory directly, without
having to interrupt the processor.
DISPLAY FIELD
One complete scanning of the video beam from top to bottom of the video display screen.
DISPLAY MODE
One of the basic types of display; for example, high or low resolution, interlaced or non-
interlaced, single or dual playfield.
DISPLAY TIME
The amount of time to produce one display field, approximately 1/60th of a second.
DISPLAY WINDOW
The portion of the bit-map selected for display. Also, the actual size of the on-screen
display.
DMA
See direct memory access.
DUAL-PLAYFIELD MODE
A display mode that allows you to manage two separate display memories, giving you two
separately controllable displays at the same time.
- Glossary 367 -